package com.xiaobias.a02;

import org.springframework.boot.autoconfigure.web.servlet.DispatcherServletRegistrationBean;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.mvc.Controller;

/**
 * 常见的 ApplicationContext 实现
 */
public class A02Application {
    public static void main(String[] args) {

//        testClassPathXmlApplicationContext();
//        testFileSystemXmlApplicationContext();
//        testAnnotationConfigApplicationContext();
        testAnnotationConfigServletWebServerAppliationContext();


//        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
//        System.out.println("读取之前的...");
//        for (String name : beanFactory.getBeanDefinitionNames()) {
//            System.out.println(name);
//        }
//        XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);
//        reader.loadBeanDefinitions(new ClassPathResource("b01.xml"));
//        System.out.println("读取之后的...");
//        for (String name : beanFactory.getBeanDefinitionNames()) {
//            System.out.println(name);
//        }

        /*
        学到到了什么
            a. 常见的 ApplicationContext 容器的实现
            b. 内嵌容器、DispatcherServlet 的创建方法、作用
         */
    }

    // 较为经典的容器，基于 classpath 下 xml 格式的配置文件来创建
    private static void testClassPathXmlApplicationContext() {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("b01.xml");
        for (String beanDefinitionName : context.getBeanDefinitionNames()) {
            System.out.println(beanDefinitionName);
        }
        System.out.println(context.getBean(Bean2.class).getBean1());
    }

    // 基于磁盘路基下 xml 格式的配置文件来创建
    private static void testFileSystemXmlApplicationContext() {
        FileSystemXmlApplicationContext context = new FileSystemXmlApplicationContext("src/main/resources/b01.xml");
        for (String beanDefinitionName : context.getBeanDefinitionNames()) {
            System.out.println(beanDefinitionName);
        }
        System.out.println(context.getBean(Bean2.class).getBean1());
    }

    // 较为经典的容器，基于 java 配置类来创建
    private static void testAnnotationConfigApplicationContext() {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
        for (String beanDefinitionName : context.getBeanDefinitionNames()) {
            System.out.println(beanDefinitionName);
        }
        System.out.println(context.getBean(Bean2.class).getBean1());
    }

    // 较为经典的容器，基于 java 配置类来创建， 用于 web 环境
    private static void testAnnotationConfigServletWebServerAppliationContext() {
        AnnotationConfigServletWebServerApplicationContext context =
                new AnnotationConfigServletWebServerApplicationContext(WebConfig.class);
    }

    @Configuration
    static class WebConfig {

        @Bean
        public ServletWebServerFactory servletWebServerFactory() {
            return new TomcatServletWebServerFactory();
        }

        @Bean
        public DispatcherServlet dispatcherServlet() {
            return new DispatcherServlet();
        }

        @Bean
        public DispatcherServletRegistrationBean registrationBean(DispatcherServlet dispatcherServlet) {
            return new DispatcherServletRegistrationBean(dispatcherServlet, "/");
        }

        @Bean("/hello")
        public Controller controller() {
            return (request, response) -> {
                response.getWriter().println("hello");
                return null;
            };
        }
    }

    @Configuration
    static class Config {

        @Bean
        public Bean1 bean1() {
            return new Bean1();
        }

        @Bean
        public Bean2 bean2(Bean1 bean1) {
            Bean2 bean2 = new Bean2();
            bean2.setBean1(bean1);
            return bean2;
        }
    }

    static class Bean1 {}

    static class Bean2 {

        private Bean1 bean1;

        public Bean1 getBean1() {
            return bean1;
        }

        public void setBean1(Bean1 bean1) {
            this.bean1 = bean1;
        }
    }
}
